John buegess simmons



NITED STATES PATENT Fries,

JOHN BURGESS SIMMONS, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR I OF ONE-HALF TO CRAIG R. ARNOLD, OF SAME PLACE.

CUT-O FF-VALVE GEAR.

SPECIFICATION, forming part of Letters Patent No. 290,808, dated December 25, 1883.

Application filed May 15, 1883, (ModeL) To all whom, it may concern.-

Be it known that 1, JOHN Buncnss SIM- MONS, a citizen of the United States, residing in the city of Philadelphia and State of Pennsylvania, have invented a certain new and useful Improved Gut-Off-Valve Gear,of which the following is a specification.

My invention relates to mechanism for automatically cutting off the supply of steam to engines, and so regulating its speed or stopping it entirely; and it consists of the devices hereinafter m ore particularly described, which, in connection with the speed-governor and the slide-valve in the steam-chest, control the supply of steam to the engine-cylinder.

In order to enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation, reference being had to the accompanying drawing, which is a front elevation of the apparatus, showing the several parts.

A is a cam -plate, inclosing an eccentric-cam, B, mixed to the crank-shaft of the engine, which said eccentric is so constructed that two of its sides are constantly in contact with two opposite sides of the cam plate. As the crank secured to the shaft 0 moves in a forward direction, the cam B follows a little ahead of right angles, and the peculiar construction of the eccentric-cam, as described, causes the cylinder-valves covering the steamports to open immediately instead of gradually, as is the case .with an eccentric constructed in the usual manner. An arm or rod, D, is connected by a pivot-joint with a link, L, supported in any proper and usual manner, and which is of the usual form for devices of that character, being an arc of a circle, and at its lower end is connected by a similar pivot-joint to the valve-rod E.

Secured at the point 1" to the foundationwalls of the engine or other supporting means is a radius-rod, R, by means of which the throw or travel of the valve-rod E is distanced and regulated, and has at its extreme end a weight, NV. The governor-block G is secured to the radius-rod R, and is slotted, in which slot it moves up and down on an upright rod, N, affixed by a pivot-joint to the horizontal rod H, connected with the governor, and a trip-pin, P, is connected with any stationary part of the mechanism.

To the governor-block G is secured, by a pivot-joint, on which it works, a latch, T,

which is constructed with a catch-hook, and supported on a pin, 0, on the rod N, and with a catch, h. When the rod N is lifted by the breaking or running off of the governor-belt, the catch it of the latch T strikes the trip-pin P and moves the latchoff the pin a, holding it on the rod N, and in consequence the radius-rod 1%, weighted by the ball WV, drops and falls wholly or partly, as may be desired, to the bottom of the link L, and so wholly or partly prevents further movement of the valve-rod. \Vhen the engine is running too rapidly and the rod N is lowered by the governor, the latch T is not unhooked, but the effect is simply to lower the radiusrod wholly or partially, as before described.

The operation of these parts on the valverod is as follows: The action of the eccentriccam operates to move the link L forward above the die-block d, which is the center of movement, and the bottom of the link moving outward and'inward alternately, the forward and back steam-cylinder ports are thus alternately opened and closed.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The automatic cut-off device, consisting of the link L and means for supporting the same, the radius-rod R, with its weight \V, the governor-block G, catch T, trip-pin I, upright rod N, and means for connecting the same with the speedgovernor, and means for vibrating the said link L, the said parts being combined, arranged, and operating substantially as set forth.

2. The cam B and cam-plate A, constructed, arranged, and operating substantially as described, in combination with mechanism for connecting the latter with the valverod of an engine, and with the automatic cutoff device, consisting of the link L, radiusrod R, with its weight XV, governor-block G, catch T, trip-pin P, and upright rod N, and also means for connecting said cut-off device with the speed-governor of an engine, as set forth.

In witness whereof I have signed my name to this specification in the presence of witnesses.

JOHN BURGESS SIMMONS.

Witnesses:

CRAIG B. ARNOLD, H. LAUSSAT GEYELIN. 

